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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# SoundConverter - GNOME application for converting between audio formats.
# Copyright 2004 Lars Wirzenius
# Copyright 2005-2012 Gautier Portet
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 3 of the License.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA
import time
from task import BackgroundTask
from settings import settings
from utils import log
class TaskQueue(BackgroundTask):
"""A queue of tasks.
A task queue is a queue of other tasks. If you need, for example, to
do simple tasks A, B, and C, you can create a TaskQueue and add the
simple tasks to it:
q = TaskQueue()
q.add_task(A)
q.add_task(B)
q.add_task(C)
q.start()
The task queue behaves as a single task. It will execute the
tasks in order and start the next one when the previous finishes."""
def __init__(self):
BackgroundTask.__init__(self)
self.waiting_tasks = []
self.running_tasks = []
self.finished_tasks = 0
self.start_time = None
self.count = 0
self.paused = False
def add_task(self, task):
"""Add a task to the queue."""
self.waiting_tasks.append(task)
#if self.start_time and not self.running_tasks:
if self.start_time:
# add a task to a stalled taskqueue, shake it!
self.start_next_task()
def start_next_task(self):
if not self.waiting_tasks:
if not self.running_tasks:
self.done()
return
to_start = settings['jobs'] - len(self.running_tasks)
for i in range(to_start):
try:
task = self.waiting_tasks.pop(0)
except IndexError:
return
self.running_tasks.append(task)
task.add_listener('finished', self.task_finished)
task.start()
if self.paused:
task.toggle_pause(True)
self.count += 1
total = len(self.waiting_tasks) + self.finished_tasks
self.progress = float(self.finished_tasks) / total if total else 0
def started(self):
""" BackgroundTask setup callback """
log('Queue start: %d tasks, %d thread(s).' % (
len(self.waiting_tasks) + len(self.running_tasks),
settings['jobs']))
self.count = 0
self.paused = False
self.finished_tasks = 0
self.start_time = time.time()
self.start_next_task()
def finished(self):
""" BackgroundTask finish callback """
log('Queue done in %.3fs (%s tasks)' % (time.time() - self.start_time,
self.count))
self.queue_ended()
self.count = 0
self.start_time = None
self.running_tasks = []
self.waiting_tasks = []
self.running = False
def task_finished(self, task=None):
if not self.running_tasks:
return
if task in self.running_tasks:
self.running_tasks.remove(task)
self.finished_tasks += 1
self.start_next_task()
def abort(self):
for task in self.running_tasks:
task.abort()
BackgroundTask.abort(self)
self.running_tasks = []
self.waiting_tasks = []
self.running = False
self.start_time = None
def toggle_pause(self, paused):
self.paused = paused
for task in self.running_tasks:
task.toggle_pause(self.paused)
# The following is called when the Queue is finished
def queue_ended(self):
pass
# The following when progress changed
def progress_hook(self, progress):
pass
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